STEM与日常科技·英语30篇（2）
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Nanomaterials and Self-Cleaning Surfaces
纳米材料与自清洁表面
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Self-cleaning surfaces often use titanium dioxide nanoparticles that become photocatalytic when exposed to UV light from sunlight.
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These activated nanoparticles break down organic dirt, bacteria, and air pollutants like nitrogen oxides into harmless molecules.
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Water sprayed on such coatings forms nearly spherical beads due to superhydrophobicity, rolling off and carrying away dust effortlessly.
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Manufacturers embed nanostructures — like microscopic pillars or grooves — into paint, glass, or textiles to create this effect.
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Buildings in Tokyo and Rome use nano-coated tiles that stay cleaner for years, cutting maintenance costs and scaffolding needs.
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In hospitals, nano-treated fabrics resist stains and microbes, reducing laundering frequency and cross-contamination risks.
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Durability remains a challenge: abrasion, chemical cleaners, or prolonged UV exposure can gradually degrade nano-coatings.
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Researchers now develop bio-inspired versions mimicking lotus leaves or shark skin to improve longevity and eco-safety.
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Regulatory agencies assess nanoparticle release during wear or washing to ensure no harmful accumulation in water or soil.
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While not magic, these surfaces demonstrate how precisely engineered materials at atomic scales deliver practical, everyday benefits.